More properties, cleanup

src/commonMain/kotlin/nl/astraeus/css/properties/EmptyCells.kt

@@ -0,0 +1,14 @@
+package nl.astraeus.css.properties
+
+class EmptyCells(
+    value: String
+) : CssProperty(value) {
+
+    companion object {
+        fun show() = EmptyCells("show")
+        fun hide() = EmptyCells("hide")
+        fun initial() = EmptyCells("initial")
+        fun inherit() = EmptyCells("inherit")
+    }
+
+}